What are the potential pitfalls of converting a website from HTML to PHP without proper knowledge and planning?

One potential pitfall of converting a website from HTML to PHP without proper knowledge and planning is introducing errors or breaking functionality due to incorrect syntax or missing PHP tags. To avoid this, it is crucial to have a solid understanding of PHP syntax and structure before attempting the conversion. Additionally, planning out the conversion process and testing thoroughly can help identify and address any issues that may arise.

<?php
// Example PHP code snippet
echo "Hello, World!";
?>